The EPA defines disinfectants as anti-microbial pesticides, whereas a common pesticide is used to control insects and rodents without regard for bacteria, viruses, and other microorganisms.The official definitions are:disinfectant - A chemical that destroys vegetative forms of harmful microorganisms, but does not ordinarily kill bacterial spores.pesticide - Substances intended to repel, kill or control any species designated a "pest" including weeds, insects ... — Lynn E. Krafft, ICAN/ATEX Associate Editorlekrafft@juno.com